Audio signal controller



FIG. 1 is a top, front and right side perspective view of an audio signal controller showing my new design;

FIG. 2 is a top, rear and left side perspective view thereof;

FIG. 3 is a bottom, rear and right side perspective view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a left side view thereof;

FIG. 7 is a right side view thereof;

FIG. 8 is a top view thereof; and,

FIG. 9 is a bottom view thereof.

The broken line illustrate portions of the audio signal controller that form no part of the claimed design. 

CLAIM The ornamental design for an audio signal controller, as shown and described. 